Novel mineral composition

摘要

A shingle assembly that contains a fiber mat and an asphalt mixture disposed within the fiber mat. The asphalt mixture contains asphalt and a mineral filler; a layer of mineral granules is disposed on the top surface of the shingle assembly; the mineral granules contain at least about 40 weight percent of limestone particles that have a hardgrove grindability index of less than 70; and the particles are coated with an oil.